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Income Taxes (Detail Textuals) - USD ($) $ in Thousands |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Mar. 27, 2020 | Dec. 31, 2017 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2020 | Mar. 31, 2019
Schedule Of Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Income tax benefit |  |  | $ 1,746 | $ (229) | $ (92) | $ (206) | $ 1,232 | $ 376 | $ (96) | $ (572) | $ 1,219 | $ 940
Federal income tax rate | 21.00% | 35.00% |  |  |  |  |  |  |  |  |  |
Undistributed earnings |  |  | $ 144,200 |  |  |  |  |  |  |  | $ 144,200 |
"CARES Act" |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Decrease in effective tax rate |  |  |  |  |  |  |  |  |  |  | (54.30%) | 20.50%
"CARES Act" | Fiscal Year 2019 Net Operating Losses |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net operating losses carryback | $ 9,700 |  |  |  |  |  |  |  |  |  |  |
Income tax refund | 3,500 |  |  |  |  |  |  |  |  |  |  |
Income tax benefit | 1,400 |  |  |  |  |  |  |  |  |  |  |
"CARES Act" | Fiscal Year 2020 Net Operating Losses |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net operating losses carryback | 3,000 |  |  |  |  |  |  |  |  |  |  |
Income tax refund | 1,000 |  |  |  |  |  |  |  |  |  |  |
Income tax benefit | $ 400 |  |  |  |  |  |  |  |  |  |  |

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